How long does a train 110 metres long running at the speed of 72 km/hr take to cross a bridge 132 metres in length? एक 110 मी. लम्बी रेलगाड़ी 72 किमी./घण्टे की चाल से चल रही है एक 132 मी. लम्बे पुल कितने समय में पार करेगी?
-
9.8 sec/सेकेण्ड
-
12.1 sec/सेकेण्ड
-
12.42 sec/सेकेण्ड
-
14.3 sec/सेकेण्ड
B
Correct answer
Explanation
Total distance to cross = train length + bridge length = 110 + 132 = 242 meters. Speed = 72 km/hr = 72 × (1000/3600) = 20 m/s. Time = Distance/Speed = 242/20 = 12.1 seconds. Option A (9.8 sec) would require a higher speed, while options C and D don't match the calculation.